var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
//引入代理服务器
//const { createProxyMiddleware } = require('http-proxy-middleware');
//配置代理服务器
/* const options = {
  target: 'http://localhost:4000', // 配置目标服务器
  changeOrigin: true, //支持跨域
  pathRewrite: {
    '^/api/': '/'// api/getstudent ->/getstudent
  }
}; */


var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
//处理静态资源(************************************)
app.use(express.static(path.join(__dirname, 'public')));

//使用代理服务器时  位置必须放到 处理静态资源之后
//处理路由事件之间（拦截发送到后台的请求）（*********************）
//const proxy = createProxyMiddleware(options);
//进行注册
//app.use("/api",proxy)
//（*********************）

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
